Watertown Municipal Utilities
Municipal electric utility · South Dakota · #909 of 3,199 U.S. utilities by customers · EIA utility #20187
Watertown Municipal Utilities is a municipal electric utility serving 14,497 customers in South Dakota. In 2025 it sold 395 gigawatt-hours of electricity for $33.55M in revenue, an average realized rate of 8.50¢ per kWh across all customer classes and 9.29¢ per kWh for residential customers. Its reported service territory covers 1 counties. EIA records its activities as: distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 11,775 | 125 | $11.62M | 9.29¢ | |
| Commercial | 2,628 | 132 | $11.49M | 8.73¢ | |
| Industrial | 94 | 138 | $10.44M | 7.56¢ | |
| Total | 14,497 | 395 | $33.55M | 8.50¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (886 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 13,420 | 381 | $30.60M | 9.10¢ |
| 2022 | 13,697 | 393 | $31.42M | 9.02¢ |
| 2023 | 13,993 | 394 | $32.11M | 8.99¢ |
| 2024 | 14,308 | 390 | $32.40M | 9.30¢ |
| 2025 | 14,497 | 395 | $33.55M | 9.29¢ |
Reliability (2025)
Average outage time (SAIDI): 4 minutes per customer per year
Average outages (SAIFI): 0.12 per customer
Average restoration time (CAIDI): 35 minutes
As reported for South Dakota under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: — GWh
Wholesale power purchased: 408 GWh
Winter peak demand: 70 MW
Energy losses: 3.2% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 0.0% of 14,602 meters
Counties served
Codington, SD
Other large utilities in South Dakota
- Black Hills Power, Inc. - 85,804 customers, residential 15.07¢
- NorthWestern Energy - (SD) - 65,396 customers, residential 13.35¢
- Sioux Valley SW Elec Coop - 30,059 customers, residential 13.87¢
- Southeastern Electric Coop Inc - (SD) - 24,428 customers, residential 12.98¢
- West River Electric Assn Inc - 21,332 customers, residential 15.16¢
- City of Brookings - (SD) - 12,568 customers, residential 10.69¢
- Black Hills Electric Coop, Inc - 11,478 customers, residential 14.79¢
- Butte Electric Coop, Inc - 7,472 customers, residential —
All South Dakota utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #20187 in the EIA frame.